Alert archive / Alabama / Areal Flood Warnings in 2021

Areal Flood Warning 11, NWS Mobile, AL

August 30, 2021George County, Greene County, Perry County, Mississippi; 4 counties in Alabama

NWS Mobile, AL issued this areal flood warning at Aug 30, 2021, 9:20 AM CDT for George County, Greene County, Perry County, Mississippi; 4 counties in Alabama. It was in force for 8 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 30, 2021, 9:20 AM CDT (14:20 UTC)
Expired
Aug 30, 2021, 5:15 PM CDT
In force
8 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Clarke County, AL, Mobile County, AL, Washington County, AL, George County, MS, Greene County, MS, Perry County, MS

The radar

The Mobile radar (KMOB), 37 km from the middle of the area, began a volume at 14:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 30, 11:33 AM CDTFLASH FLOOD2 Ssw Mobile Regional A, ALUP TO ONE FOOT OF RAPIDLY MOVING WATER ACROSS ROADWAYS.
Aug 30, 2:03 PM CDTFLASH FLOODSeven Hills, ALMOBILE COUNTY OFFICIALS REPORT FLASH FLOODING WITH WATER OVER THE ROADWAYS ON AIRPORT BLVD WEST OF JOHNSON RD, NEWMAN RD BETWEEN AIRPORT BLVD & BUSBY RD, GASTON LOOP AT TOM GASTON RD, CAT DEAKLE RD WEST OF GASTON LOOP, AND TANNER WILLIAMS AT HUBERT PIERCE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.3 hours before the alert went out and 184 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2021-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 881 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2021-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 386 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
881 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
560 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
386 m²/s²
0-3 km storm-relative helicity
386 m²/s²
Significant tornado parameter
1.1
Supercell composite
9.7

Open this sounding in Storm Lab

The text

As transmitted.

234 
WGUS44 KMOB 301420
FLWMOB

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mobile AL
920 AM CDT Mon Aug 30 2021

ALC003-025-097-129-MSC039-041-111-302015-
/O.NEW.KMOB.FA.W.0011.210830T1420Z-210830T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-Clarke AL-Mobile AL-Washington AL-George MS-Greene MS-
Perry MS-
920 AM CDT Mon Aug 30 2021

The National Weather Service in Mobile has issued a

* Flood Warning for...
  Baldwin County in southwestern Alabama...
  Southwestern Clarke County in southwestern Alabama...
  Mobile County in southwestern Alabama...
  Southern Washington County in southwestern Alabama...
  George County in southeastern Mississippi...
  Greene County in southeastern Mississippi...
  Southeastern Perry County in southeastern Mississippi...

* Until 315 PM CDT.

* At 920 AM CDT, Doppler radar indicated heavy rain due to 
  thunderstorms. Flooding is ongoing or expected to begin shortly in 
  the warned area.

* Some locations that will experience flooding include...
  Midtown Mobile, Downtown Mobile, Prichard, Daphne, Tillmans 
  Corner, Fairhope, Saraland, Gulf Shores, Bay Minette, Foley, 
  Theodore, Chickasaw, Satsuma, Orange Beach, Spanish Fort, Grand 
  Bay, Robertsdale, Citronelle, Lucedale and Bayou La Batre.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3143 8897 3145 8775 3134 8772 3136 8776
      3131 8778 3130 8771 3087 8763 3032 8746
      3032 8750 3031 8744 3029 8754 3029 8749
      3028 8753 3028 8755 3025 8742 3020 8748
      3016 8837 3074 8841 3073 8871

$$
1 follow-up statement
406 
WGUS44 KMOB 302007
FLWMOB

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mobile AL
307 PM CDT Mon Aug 30 2021

ALC003-025-097-129-MSC039-041-111-302215-
/O.EXT.KMOB.FA.W.0011.000000T0000Z-210830T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-Clarke AL-Mobile AL-Washington AL-George MS-Greene MS-
Perry MS-
307 PM CDT Mon Aug 30 2021

The National Weather Service in Mobile has extended the

* Flood Warning for...
  Baldwin County in southwestern Alabama...
  Southwestern Clarke County in southwestern Alabama...
  Mobile County in southwestern Alabama...
  Southern Washington County in southwestern Alabama...
  George County in southeastern Mississippi...
  Greene County in southeastern Mississippi...
  Southeastern Perry County in southeastern Mississippi...

* Until 515 PM CDT.

* At 307 PM CDT, Doppler radar indicated rainfall amounts of 3 to 5 
  inches having fallen from thunderstorms this morning through early 
  this afternoon, along with local reports of up to 6 inches. 
  Flooding is ongoing or expected to begin shortly in the warned 
  area.

* Some locations that will experience flooding include...
  Midtown Mobile, Downtown Mobile, Prichard, Daphne, Tillmans 
  Corner, Fairhope, Saraland, Gulf Shores, Bay Minette, Foley, 
  Theodore, Chickasaw, Satsuma, Orange Beach, Spanish Fort, Grand 
  Bay, Robertsdale, Citronelle, Lucedale and Bayou La Batre.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3143 8897 3145 8775 3134 8772 3136 8776
      3131 8778 3130 8771 3087 8763 3032 8746
      3032 8750 3031 8744 3029 8754 3029 8749
      3028 8753 3028 8755 3025 8742 3020 8748
      3016 8837 3074 8841 3073 8871

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 29, 7:07 PM CDTTornado WarningMOBGeorge25 min
Aug 29, 11:30 PM CDTFlash Flood WarningMOBStone6 hr
Aug 30, 12:29 AM CDTFlash Flood WarningMOBGeorge, Perry, Stone6 hr
Aug 30, 3:24 AM CDTFlash Flood WarningMOBGeorge, Greene, Perry6 hr
Aug 30, 3:39 AM CDTTornado WarningMOBGeorge, Greene, Perry20 min
Aug 30, 6:05 AM CDTFlash Flood WarningMOBStone4 hr
Aug 30, 6:20 AM CDTFlash Flood WarningMOBGeorge, Greene, Perry, Stone5 hr
Aug 30, 2:32 PM CDTTornado WarningMOBWayne21 min
Aug 30, 5:19 PM CDTAreal Flood WarningMOBGeorge14 hr
Aug 30, 6:28 PM CDTSpecial Weather StatementMOBGeorge47 min
Aug 29, 8:19 PM CDTRiver Flood WarningMOBEscambia49 hr
Aug 29, 8:21 PM CDTRiver Flood WarningMOBCovington, Escambia38 hr
Aug 29, 8:35 PM CDTRiver Flood WarningMOBBaldwin30 hr
Aug 29, 11:27 PM CDTSpecial Marine WarningMOB93 min
Aug 30, 12:13 AM CDTSpecial Marine WarningMOB47 min
Aug 30, 12:59 AM CDTSpecial Marine WarningMOB2 hr
Aug 30, 4:03 AM CDTSpecial Marine WarningMOB117 min
Aug 30, 6:42 AM CDTFlash Flood WarningMOBBaldwin, Escambia5 hr
Aug 30, 6:46 AM CDTSpecial Marine WarningMOB119 min
Aug 30, 8:29 AM CDTFlash Flood WarningMOBConecuh, Escambia, Monroe4 hr
Aug 30, 8:32 AM CDTFlash Flood WarningMOBEscambia4 hr
Aug 30, 8:40 AM CDTTornado WarningMOBConecuh, Escambia50 min
Aug 30, 9:00 AM CDTFlash Flood WarningMOBClarke, Conecuh, Escambia, Monroe, Wilcox4 hr
Aug 30, 9:12 AM CDTFlash Flood WarningMOBConecuh, Escambia4 hr
Aug 30, 10:26 AM CDTFlash Flood WarningMOBMobile6 hr
Aug 30, 10:51 AM CDTSpecial Marine WarningMOB54 min
Aug 30, 10:55 AM CDTTornado WarningMOBMobile, Washington25 min
Aug 30, 11:47 AM CDTFlash Flood WarningMOBClarke, Washington5 hr
Aug 30, 11:57 AM CDTFlash Flood WarningMOBBaldwin, Clarke, Mobile, Washington5 hr
Aug 30, 12:03 PM CDTFlash Flood WarningMOBEscambia75 min
Aug 30, 12:23 PM CDTTornado Warning Tornado observedMOBBaldwin, Mobile21 min
Aug 30, 12:30 PM CDTTornado Warning Tornado observedMOBBaldwin, Clarke, Mobile, Washington45 min
Aug 30, 1:08 PM CDTTornado Warning Tornado observedMOBClarke52 min
Aug 30, 1:39 PM CDTTornado Warning Tornado observedMOBClarke, Wilcox39 min
Aug 30, 3:57 PM CDTSpecial Marine WarningMOB48 min
Aug 30, 4:11 PM CDTCoastal Flood WarningMOBBaldwin, Mobile14 hr
Aug 30, 4:18 PM CDTSpecial Marine WarningMOB87 min
Aug 30, 4:20 PM CDTSpecial Marine WarningMOB85 min
Aug 30, 5:05 PM CDTSpecial Weather StatementMOBCovington55 min
Aug 30, 5:29 PM CDTSpecial Marine WarningMOB91 min
Aug 30, 6:46 PM CDTSpecial Marine WarningMOB89 min

Nearby

Areal Flood Warnings in Alabama, 2021Areal Flood Warnings in Mississippi, 2021Every areal flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.